SIR – Can anyone please tell me where I can buy the device which many trucks, vans and some cars seem to be fitted with?

It’s the one that allows you to change lanes on the motorway without any warning, regardless of how near other overtaking vehicles are.

The device is activated by minimal use of the indicator just prior to pulling out.

The device can also be used in reverse to disable indicators when drivers are entering or exiting roundabouts.

Still, it’s not all bad news – many drivers now seem to be bowing their heads in prayer when queuing in traffic, or are they just sending texts?

Bryan Hanson, Busy Lane, Windhill, Shipley